Once the receiving router is receiving the same data at the same time over both the fiber link and Starlink, the sending router can stop sending over Starlink. The sending router would send the burst of data through the fiber link and also buffer it and send it through Starlink at the original rate. The sending router would send fake ACKs to the server to get it to send data faster. If the remote server could increase the data rate, then the ISP could perform the transition with no drop in throughput seen by the client. The client would see the throughput go down during the transition period. This would require some RAM, but only during the transition period for each TCP session. They could even make the transition smooth, by buffering data transferred over Starlink and slowly adding delay to match the delay of the fiber connection. They could have the routers on each end automatically switch large one-way TCP transfers from the Starlink connection to the fiber connection after the first 2MB. I expect some ISPs will end up using differential routing over Starlink and fiber. I used to proxy my browser through SSH to a US server and enjoy very fast text-mode browsing. All other traffic went through a very low-bandwidth low-latency fiber connection. They ran a transparent HTTP proxy that routed through a high-bandwidth high-latency satellite connection. In 1998, I lived in Ghana and used the Africa Online ISP.
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